Image copyrightEPAImage caption
The ELN has marked its new territory in parts of Cauca province held until recently by the Farc

Colombia's indigenous agency (Onic) has expressed concern over the presence of fighters from the ELN, or National Liberation Army, in areas traditionally held by the Farc rebel group.

The government and the Farc are expected to sign a historic peace accord on 23 March.

The head of the agency, Luis Fernando Arias, urged the authorities to investigate.

He said the indigenous people fear the presence of the ELN on their land.

Indigenous groups in many parts of the country have found ELN propaganda material in their areas, said Mr Arias.

"Since the Farc declared its unilateral ceasefire [in December 2014] we have begun to see evidence of presence of the ELN in areas of Vale del Cauca, Norte del Cauca, Choco and Narino where they had never been," he said.

"So people began to ask themselves if there had been a change of command," added Mr Arias.